So far in our Elite Status Series, weâve covered American, Delta and Southwest. Today, TPG contributor Jason Steele takes us through the basics of United Premier Silver status â how you can qualify for it and maximize the benefits once you earn it. Unless you have a last-minute mileage run planned, itâs probably too late to worry about achieving status during the 2013 calendar year.
backfire - a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine blowup, detonation, explosion - a violent release of energy caused by a chemical or nuclear reaction
      A backfire is when the ignition of fuel doesn't take place in the ignition/combustion chamber, it(a backfire) can take place in the intake or exhaust. It can â¦ be caused by a fuel to air ratio not being correct, also if the timing of the spark is not just right that could cause it to back fire. A large backfire is most likely caused by a bad spark plug or plug wire. Unburned air and fuel pumped into the exhaust will often be ignited by the other cylinders still â¦ burning exhaust gases.